CN101749133B - Idle speed minor adjustment, PTO and cruise control intelligent control method of electric control diesel engine - Google Patents

Abstract

The invention relates to a three-in-one intelligent control method of idle speed fine-tuning, PTO and cruise control of an electronically controlled diesel engine. Depending on the vehicle's operating conditions and the driver's intentions, one of the functions is activated and operated. Compared with the prior art, the invention has the advantages of convenient operation, cost reduction and the like.

Description

Three-in-one intelligent control method of electronically controlled diesel engine idling fine-tuning, PTO and cruise control

technical field

The invention relates to a diesel engine and its control system, in particular to a three-in-one intelligent control method for electronically controlled diesel engine idling fine-tuning, PTO and cruise control.

Background technique

The idle speed fine-tuning function allows the driver to manually adjust the target idle speed through the switch on the instrument panel when the diesel engine is at idle speed; the power output PTO (Power Take Off) function allows the driver to make the diesel engine Enter the fixed speed operation mode to meet the power output requirements other than the wheels; when the car is driving on a long-distance expressway, start the cruise control function to automatically fix the vehicle at a specific speed, eliminating the need for drivers to pedal for a long time Throttle pain.

At present, the above three functions are realized in the diesel engine through the electronic control unit ECU (Electronic Control Unit). Generally, independent switch groups are used, and independent control programs are used. Unit ECU. These existing technologies not only need to configure many control switches on the dashboard of the cab, but even add an additional ECU, resulting in increased hardware costs; and independent control programs lead to increased software code and unnecessary repetition, resulting in Increased costs. Therefore, how to reduce software and hardware expenses as much as possible and simultaneously satisfy the control and use requirements of the three functions is a problem to be solved in the prior art.

Contents of the invention

The object of the present invention is to provide a three-in-one intelligent control method of electronically controlled diesel engine idling fine-tuning, PTO and constant speed cruise, which is easy to operate and can reduce costs in order to overcome the shortcomings of the above-mentioned prior art.

The purpose of the present invention can be achieved through the following technical solutions:

The three-in-one intelligent control method of electronically controlled diesel engine idle speed fine-tuning, PTO and cruise control is characterized in that the three-in-one intelligent control of idle speed fine-tuning, PTO and constant speed cruise shares a set of four self-resetting switches, according to different diesel engines and vehicles. To activate and operate one of the functions based on the working conditions and the driver's intention, the judgment of the activation conditions of the three functions and the control process mainly include the following steps:

(1) The ECU first processes the signals such as the current speed of the diesel engine, the current speed of the vehicle and other switch inputs;

(2) According to the above parameters, it is judged whether the activation condition of constant speed cruise is satisfied, if the result is yes, then perform step (3), if the result is no, then perform step (8);

(3) When the constant speed cruise activation condition is met, you can jog the enable switch, or jog the micro-increase or micro-decrease switch to enter the cruise function mode;

(4) Transfer the single-step increment and deceleration step size, continuous increment and deceleration rate, and the maximum and minimum limit values of vehicle speed adjustment into the "target speed or vehicle speed calculator" for cruise fine-tuning, and transfer the proportional, integral and differential gain parameters into the "closed-loop control device";

(5) Determine whether it is the first time to enter after the ECU is powered on, or whether the constant speed cruise function mode is entered by the micro-increase or micro-decrease switch, if the result is yes, then perform step (6), if the result is no, Then execute step (7);

(6) Use the current vehicle speed as the initial cruising target vehicle speed, and transfer to the "target speed or vehicle speed calculator";

(7) The cruising vehicle speed that was finally adjusted and determined when exiting cruising last time is used as the initial cruising target vehicle speed this time, and transferred into the "target speed or vehicle speed calculator";

(8) According to signal parameters such as rotating speed and vehicle speed and switch, judge whether to satisfy the activation condition of PTO, if the result is yes, then execute step (9), if the result is no, then execute step (12);

(9) When the PTO activation conditions are met, only the jog enable switch is supported to enter the PTO function mode;

(10) Transfer the single-step increment and decrement step size of PTO fine-tuning, the maximum and minimum limit value of speed adjustment into the "target speed or vehicle speed calculator", and transfer the proportional, integral and differential gain parameters into the "closed-loop controller";

(11) Use the initial PTO speed as the initial PTO target speed, and transfer to the "target speed or vehicle speed calculator";

(12) According to signal parameters such as rotating speed and vehicle speed and switch, judge whether to satisfy the activation condition of idle speed trimming, if the result is yes, then perform step (13), if the result is no, then perform step (20);

(13) When the idle speed fine-tuning activation conditions are met, it supports jog or long press to operate the enabling switch to enter the idle speed fine-tuning function mode;

(14) Transfer the single-step increment and decrement step size of idle speed fine-tuning, the highest and lowest limit value of idle speed adjustment into the "target speed or vehicle speed calculator", and transfer the proportional, integral and differential gain parameters into the "closed-loop controller";

(15) Judging whether to enter the idle speed fine-tuning function mode in the mode of jog enabling switch, if the result is yes, then perform step (16), if the result is no, then perform step (17);

(16) With the current idle speed as the initial target idle speed, transfer to the "target speed or vehicle speed calculator";

(17) Take the factory set idle speed as the initial target idle speed, and transfer to the "target speed or vehicle speed calculator";

(18) Target speed or vehicle speed calculator: According to the jog and long press of the micro-increase and micro-decrease switches, the target speed or vehicle speed is controlled to increase or decrease, and it is saved when exiting the function mode;

(19) Closed-loop controller: according to the currently activated function, the closed-loop control is performed according to the corresponding proportional, integral and differential gain parameters for the fine-tuned target speed or vehicle speed;

(20) The activation conditions of the three functions are not satisfied, and the ECU performs other normal operations, and judges again when the control module is called in the next cycle.

Compared with the prior art, the present invention has the following advantages:

(1) It only needs to install four self-resetting switches on the dashboard of the cab to meet all the operation requirements of the three functions, which not only reduces the cost of vehicle manufacturing, but also facilitates the operation of the driver.

(2) Fully utilizing the resources of the existing electronically controlled diesel engine control unit ECU and control system sensors and actuators, there is almost no need to increase any additional hardware costs, which greatly enhances the function and competitiveness of domestic electronically controlled diesel engines.

(3) The three-in-one intelligent control software design method greatly reduces the amount of program code, enhances the reusability of software, and is beneficial to reduce software development and application costs.

Description of drawings

Fig. 1 is a flow chart showing the control strategy of the three-in-one intelligent control module of idling fine-tuning, PTO and cruise control.

Fig. 2 is a schematic diagram showing the hardware composition of the input and output of the three-in-one intelligent control module of idle speed fine-tuning, PTO and cruise control, and the control signal flow.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing.

As shown in Figure 1, the three-in-one intelligent control of idling fine-tuning, PTO and cruise control shares a group of four self-resetting switches, and activates and operates one of the functions according to the different working conditions of the diesel engine and the vehicle and the driver's intention. The activation condition judgment and control process of the three functions mainly include the following steps:

(1) The ECU first processes the signals such as the current speed of the diesel engine, the current speed of the vehicle and other switch inputs;

(2) According to the above parameters, it is judged whether the activation condition of constant speed cruise is satisfied, if the result is yes, then perform step (3), if the result is no, then perform step (8);

(3) When the constant speed cruise activation condition is met, you can jog the enable switch, or jog the micro-increase or micro-decrease switch to enter the cruise function mode;

(4) Transfer the single-step increment and deceleration step size, continuous increment and deceleration rate, and the maximum and minimum limit values of vehicle speed adjustment into the "target speed or vehicle speed calculator" for cruise fine-tuning, and transfer the proportional, integral and differential gain parameters into the "closed-loop control device";

(5) Determine whether it is the first time to enter after the ECU is powered on, or whether the constant speed cruise function mode is entered by the micro-increase or micro-decrease switch, if the result is yes, then perform step (6), if the result is no, Then execute step (7);

(6) Use the current vehicle speed as the initial cruising target vehicle speed, and transfer to the "target speed or vehicle speed calculator";

(7) The cruising vehicle speed that was finally adjusted and determined when exiting cruising last time is used as the initial cruising target vehicle speed this time, and transferred into the "target speed or vehicle speed calculator";

(8) According to signal parameters such as rotating speed and vehicle speed and switch, judge whether to satisfy the activation condition of PTO, if the result is yes, then execute step (9), if the result is no, then execute step (12);

(9) When the PTO activation conditions are met, only the jog enable switch is supported to enter the PTO function mode;

(10) Transfer the single-step increment and decrement step size of PTO fine-tuning, the maximum and minimum limit value of speed adjustment into the "target speed or vehicle speed calculator", and transfer the proportional, integral and differential gain parameters into the "closed-loop controller";

(11) Use the initial PTO speed as the initial PTO target speed, and transfer to the "target speed or vehicle speed calculator";

(12) According to signal parameters such as rotating speed and vehicle speed and switch, judge whether to satisfy the activation condition of idle speed trimming, if the result is yes, then perform step (13), if the result is no, then perform step (20);

(13) When the idle speed fine-tuning activation conditions are met, it supports jog or long press to operate the enabling switch to enter the idle speed fine-tuning function mode;

(14) Transfer the single-step increment and decrement step size of idle speed fine-tuning, the highest and lowest limit value of idle speed adjustment into the "target speed or vehicle speed calculator", and transfer the proportional, integral and differential gain parameters into the "closed-loop controller";

(15) Judging whether to enter the idle speed fine-tuning function mode in the mode of jog enabling switch, if the result is yes, then perform step (16), if the result is no, then perform step (17);

(16) With the current idle speed as the initial target idle speed, transfer to the "target speed or vehicle speed calculator";

(17) Take the factory set idle speed as the initial target idle speed, and transfer to the "target speed or vehicle speed calculator";

(18) Target speed or vehicle speed calculator: According to the jog and long press of the micro-increase and micro-decrease switches, the target speed or vehicle speed is controlled to increase or decrease, and it is saved when exiting the function mode;

(19) Closed-loop controller: according to the currently activated function, the closed-loop control is performed according to the corresponding proportional, integral and differential gain parameters for the fine-tuned target speed or vehicle speed;

(20) The activation conditions of the three functions are not satisfied, and the ECU performs other normal operations, and judges again when the control module is called in the next cycle.

As shown in Figure 2, the ECU first collects and processes the current wheel speed and diesel engine speed in real time through the vehicle speed sensor and the rotational speed sensor respectively and provides them to the intelligent control module. On the other hand, sensors or switches such as clutches, brakes, accelerator pedals, and exhaust brake switches feed back the driver's driving intentions to the ECU in real time. These signals are also used by the intelligent control module to select the current control mode and decide whether to activate or exit the current function. basis. Last but not least, once the intelligent control module determines the currently active function mode, it will reset the driver's control of the diesel engine according to the four-key self-resetting switch group consisting of the enable switch, the micro-increase switch, the micro-decrease switch and the exit switch. Target idle speed or rotational speed or vehicle speed setting requirements. The diesel engine electronic control unit ECU calculates the current fuel injection quantity and fuel injection advance angle based on the above information and combined with the current working conditions of the diesel engine, and drives the fuel injector or fuel supply pump of the electronically controlled fuel injection system to work.

Claims (1)

1. The three-in-one intelligent control method of electronically controlled diesel engine idle speed fine-tuning, PTO and cruise control, characterized in that the three-in-one intelligent control of idle speed fine-tuning, PTO and cruise control shares a set of four self-resetting switches, according to the diesel engine and vehicle Depending on the working situation and the driver's intention to activate and operate one of the functions, the activation condition judgment and control process of the three functions mainly include the following steps: (1) The ECU first processes the current speed of the diesel engine and the current speed of the vehicle; (2) According to the above parameters, it is judged whether the activation condition of constant speed cruise is satisfied, if the result is yes, then perform step (3), if the result is no, then perform step (8); (3) When the constant speed cruise activation condition is met, you can jog the enable switch, or jog the micro-increase or micro-decrease switch to enter the cruise function mode; (4) Transfer the single-step increment and deceleration step size, continuous increment and deceleration rate, and the maximum and minimum limit values of vehicle speed adjustment into the "target speed or vehicle speed calculator" for cruise fine-tuning, and transfer the proportional, integral and differential gain parameters into the "closed-loop controller "; (5) Determine whether it is the first time to enter after the ECU is powered on, or whether the constant speed cruise function mode is entered by the micro-increase or micro-decrease switch, if the result is yes, then perform step (6), if the result is no, Then execute step (7); (6) Use the current vehicle speed as the initial cruising target vehicle speed, and transfer to the "target speed or vehicle speed calculator"; (7) The cruising vehicle speed that was finally adjusted and determined when exiting cruising last time is used as the initial cruising target vehicle speed this time, and transferred into the "target speed or vehicle speed calculator"; (8) According to rotating speed and vehicle speed and switch signal parameter, judge whether to satisfy the activation condition of PTO, if the result is yes, then execute step (9), if the result is no, then execute step (12); (9) When the PTO activation conditions are met, only the jog enable switch is supported to enter the PTO function mode; (10) Transfer the single-step increment and decrement step size of PTO fine-tuning, the maximum and minimum limit value of speed adjustment into the "target speed or vehicle speed calculator", and transfer the proportional, integral and differential gain parameters into the "closed-loop controller"; (11) Use the initial PTO speed as the initial PTO target speed, and transfer to the "target speed or vehicle speed calculator"; (12) According to rotating speed and vehicle speed and switch signal parameter, judge whether to satisfy the activation condition of idle speed trimming, if the result is yes, then execute step (13), if the result is no, then execute step (20); (13) When the idle speed fine-tuning activation conditions are met, it supports jog or long press to operate the enabling switch to enter the idle speed fine-tuning function mode; (14) Transfer the single-step increment and decrement step size of idle speed fine-tuning, the highest and lowest limit value of idle speed adjustment into the "target speed or vehicle speed calculator", and transfer the proportional, integral and differential gain parameters into the "closed-loop controller"; (15) Judging whether to enter the idle speed fine-tuning function mode in the mode of jog enabling switch, if the result is yes, then perform step (16), if the result is no, then perform step (17); (16) With the current idle speed as the initial target idle speed, transfer to the "target speed or vehicle speed calculator"; (17) Take the factory set idle speed as the initial target idle speed, and transfer to the "target speed or vehicle speed calculator"; (18) Target speed or vehicle speed calculator: According to the jog and long press of the micro-increase and micro-decrease switches, the target speed or vehicle speed is controlled to increase or decrease, and it is saved when exiting the function mode; (19) Closed-loop controller: according to the currently activated function, the closed-loop control is performed according to the corresponding proportional, integral and differential gain parameters for the fine-tuned target speed or vehicle speed; (20) The activation conditions of the three functions are not satisfied, and the ECU performs other normal operations, and judges again when the control module is called in the next cycle.

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